diff --git a/drivers/usb/host/xhci-mem.c b/drivers/usb/host/xhci-mem.c index b1f27aa38b1008..7e417b71d24cbd 100644 --- a/drivers/usb/host/xhci-mem.c +++ b/drivers/usb/host/xhci-mem.c @@ -2491,9 +2491,11 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) * Event ring setup: Allocate a normal ring, but also setup * the event ring segment table (ERST). Section 4.9.3. */ + val2 = 1 << HCS_ERST_MAX(xhci->hcs_params2); + val2 = min_t(unsigned int, ERST_MAX_SEGS, val2); xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Allocating event ring"); - xhci->event_ring = xhci_ring_alloc(xhci, ERST_NUM_SEGS, 1, TYPE_EVENT, - 0, flags); + xhci->event_ring = xhci_ring_alloc(xhci, val2, 1, TYPE_EVENT, + 0, flags); if (!xhci->event_ring) goto fail; if (xhci_check_trb_in_td_math(xhci) < 0) @@ -2506,7 +2508,7 @@ int xhci_mem_init(struct xhci_hcd *xhci, gfp_t flags) /* set ERST count with the number of entries in the segment table */ val = readl(&xhci->ir_set->erst_size); val &= ERST_SIZE_MASK; - val |= ERST_NUM_SEGS; + val |= val2; xhci_dbg_trace(xhci, trace_xhci_dbg_init, "// Write ERST size = %i to ir_set 0 (some bits preserved)", val); diff --git a/drivers/usb/host/xhci.h b/drivers/usb/host/xhci.h index 3a6c451777e7dc..ec515c563a37e2 100644 --- a/drivers/usb/host/xhci.h +++ b/drivers/usb/host/xhci.h @@ -1643,8 +1643,8 @@ struct urb_priv { * Each segment table entry is 4*32bits long. 1K seems like an ok size: * (1K bytes * 8bytes/bit) / (4*32 bits) = 64 segment entries in the table, * meaning 64 ring segments. - * Initial allocated size of the ERST, in number of entries */ -#define ERST_NUM_SEGS 1 + * Maximum number of segments in the ERST */ +#define ERST_MAX_SEGS 8 /* Initial allocated size of the ERST, in number of entries */ #define ERST_SIZE 64 /* Initial number of event segment rings allocated */